Supercavitation Pulse (IMAGE) Penn State Caption This is a photograph of a second order pulsating supercavity in the Penn State ARL Garfield Thomas Water Tunnel facility's 12-inch diameter water tunnel. The circular object is a window mounted hydrophone. Credit Penn State Applied Research Laboratory Usage Restrictions Non commercial use License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.